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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 16:26:39 +07:00
x86: reduce stack usage in init_intel_cacheinfo
Impact: reduce stack usage. init_intel_cacheinfo() does not use the cpumask so define a subset of struct _cpuid4_info (_cpuid4_info_regs) that can be used instead. Signed-off-by: Mike Travis <travis@sgi.com>
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@ -132,7 +132,16 @@ struct _cpuid4_info {
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union _cpuid4_leaf_ecx ecx;
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unsigned long size;
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unsigned long can_disable;
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cpumask_t shared_cpu_map; /* future?: only cpus/node is needed */
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DECLARE_BITMAP(shared_cpu_map, NR_CPUS);
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};
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/* subset of above _cpuid4_info w/o shared_cpu_map */
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struct _cpuid4_info_regs {
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union _cpuid4_leaf_eax eax;
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union _cpuid4_leaf_ebx ebx;
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union _cpuid4_leaf_ecx ecx;
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unsigned long size;
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unsigned long can_disable;
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};
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#ifdef CONFIG_PCI
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@ -263,7 +272,7 @@ amd_cpuid4(int leaf, union _cpuid4_leaf_eax *eax,
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}
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static void __cpuinit
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amd_check_l3_disable(int index, struct _cpuid4_info *this_leaf)
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amd_check_l3_disable(int index, struct _cpuid4_info_regs *this_leaf)
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{
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if (index < 3)
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return;
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@ -271,7 +280,8 @@ amd_check_l3_disable(int index, struct _cpuid4_info *this_leaf)
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}
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static int
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__cpuinit cpuid4_cache_lookup(int index, struct _cpuid4_info *this_leaf)
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__cpuinit cpuid4_cache_lookup_regs(int index,
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struct _cpuid4_info_regs *this_leaf)
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{
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union _cpuid4_leaf_eax eax;
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union _cpuid4_leaf_ebx ebx;
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@ -299,6 +309,15 @@ __cpuinit cpuid4_cache_lookup(int index, struct _cpuid4_info *this_leaf)
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return 0;
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}
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static int
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__cpuinit cpuid4_cache_lookup(int index, struct _cpuid4_info *this_leaf)
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{
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struct _cpuid4_info_regs *leaf_regs =
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(struct _cpuid4_info_regs *)this_leaf;
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return cpuid4_cache_lookup_regs(index, leaf_regs);
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}
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static int __cpuinit find_num_cache_leaves(void)
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{
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unsigned int eax, ebx, ecx, edx;
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@ -338,11 +357,10 @@ unsigned int __cpuinit init_intel_cacheinfo(struct cpuinfo_x86 *c)
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* parameters cpuid leaf to find the cache details
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*/
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for (i = 0; i < num_cache_leaves; i++) {
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struct _cpuid4_info this_leaf;
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struct _cpuid4_info_regs this_leaf;
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int retval;
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retval = cpuid4_cache_lookup(i, &this_leaf);
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retval = cpuid4_cache_lookup_regs(i, &this_leaf);
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if (retval >= 0) {
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switch(this_leaf.eax.split.level) {
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case 1:
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@ -491,17 +509,20 @@ static void __cpuinit cache_shared_cpu_map_setup(unsigned int cpu, int index)
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num_threads_sharing = 1 + this_leaf->eax.split.num_threads_sharing;
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if (num_threads_sharing == 1)
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cpu_set(cpu, this_leaf->shared_cpu_map);
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cpumask_set_cpu(cpu, to_cpumask(this_leaf->shared_cpu_map));
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else {
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index_msb = get_count_order(num_threads_sharing);
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for_each_online_cpu(i) {
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if (cpu_data(i).apicid >> index_msb ==
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c->apicid >> index_msb) {
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cpu_set(i, this_leaf->shared_cpu_map);
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cpumask_set_cpu(i,
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to_cpumask(this_leaf->shared_cpu_map));
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if (i != cpu && per_cpu(cpuid4_info, i)) {
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sibling_leaf = CPUID4_INFO_IDX(i, index);
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cpu_set(cpu, sibling_leaf->shared_cpu_map);
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sibling_leaf =
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CPUID4_INFO_IDX(i, index);
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cpumask_set_cpu(cpu, to_cpumask(
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sibling_leaf->shared_cpu_map));
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}
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}
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}
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@ -513,9 +534,10 @@ static void __cpuinit cache_remove_shared_cpu_map(unsigned int cpu, int index)
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int sibling;
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this_leaf = CPUID4_INFO_IDX(cpu, index);
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for_each_cpu_mask_nr(sibling, this_leaf->shared_cpu_map) {
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for_each_cpu(sibling, to_cpumask(this_leaf->shared_cpu_map)) {
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sibling_leaf = CPUID4_INFO_IDX(sibling, index);
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cpu_clear(cpu, sibling_leaf->shared_cpu_map);
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cpumask_clear_cpu(cpu,
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to_cpumask(sibling_leaf->shared_cpu_map));
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}
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}
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#else
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@ -620,8 +642,9 @@ static ssize_t show_shared_cpu_map_func(struct _cpuid4_info *this_leaf,
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int n = 0;
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if (len > 1) {
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cpumask_t *mask = &this_leaf->shared_cpu_map;
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const struct cpumask *mask;
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mask = to_cpumask(this_leaf->shared_cpu_map);
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n = type?
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cpulist_scnprintf(buf, len-2, mask) :
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cpumask_scnprintf(buf, len-2, mask);
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@ -684,7 +707,8 @@ static struct pci_dev *get_k8_northbridge(int node)
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static ssize_t show_cache_disable(struct _cpuid4_info *this_leaf, char *buf)
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{
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int node = cpu_to_node(first_cpu(this_leaf->shared_cpu_map));
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const struct cpumask *mask = to_cpumask(this_leaf->shared_cpu_map);
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int node = cpu_to_node(cpumask_first(mask));
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struct pci_dev *dev = NULL;
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ssize_t ret = 0;
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int i;
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@ -718,7 +742,8 @@ static ssize_t
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store_cache_disable(struct _cpuid4_info *this_leaf, const char *buf,
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size_t count)
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{
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int node = cpu_to_node(first_cpu(this_leaf->shared_cpu_map));
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const struct cpumask *mask = to_cpumask(this_leaf->shared_cpu_map);
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int node = cpu_to_node(cpumask_first(mask));
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struct pci_dev *dev = NULL;
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unsigned int ret, index, val;
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@ -863,7 +888,7 @@ static int __cpuinit cpuid4_cache_sysfs_init(unsigned int cpu)
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return -ENOMEM;
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}
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static cpumask_t cache_dev_map = CPU_MASK_NONE;
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static DECLARE_BITMAP(cache_dev_map, NR_CPUS);
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/* Add/Remove cache interface for CPU device */
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static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
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@ -903,7 +928,7 @@ static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
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}
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kobject_uevent(&(this_object->kobj), KOBJ_ADD);
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}
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cpu_set(cpu, cache_dev_map);
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cpumask_set_cpu(cpu, to_cpumask(cache_dev_map));
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kobject_uevent(per_cpu(cache_kobject, cpu), KOBJ_ADD);
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return 0;
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@ -916,9 +941,9 @@ static void __cpuinit cache_remove_dev(struct sys_device * sys_dev)
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if (per_cpu(cpuid4_info, cpu) == NULL)
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return;
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if (!cpu_isset(cpu, cache_dev_map))
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if (!cpumask_test_cpu(cpu, to_cpumask(cache_dev_map)))
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return;
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cpu_clear(cpu, cache_dev_map);
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cpumask_clear_cpu(cpu, to_cpumask(cache_dev_map));
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for (i = 0; i < num_cache_leaves; i++)
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kobject_put(&(INDEX_KOBJECT_PTR(cpu,i)->kobj));
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